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Brown spots on aeroponic seedlings early

endorflight
endorflightstarted grow question 9 hours ago
One of the seedlings suddenly shows brown spots on the lower leaves. Week: 3 PPFD: 350 VPD: 1.0 - 1.2 Ventilation: Off EC: 0.5 PH: 6.2 Water: RO Nutrients: AN Conisseur Grow + a little bit AN Silica
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Lerome
Leromeanswered grow question 2 hours ago
might not have enough calmag with that ro water...
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